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Thread: M119 Dyno Results. (1993 400E US)

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    M119 Dyno Results. (1993 400E US)

    Thought it may be interesting to some here. 110k on the odometer. Car has engine computer from a 1992 model (adds power, supposedly). Did the dyno test to see how the engine is doing. It's silly, but hearing that engine sound like a perfectly-working (to my ears) airplane's turbofan was somewhat emotional. What do you guys think?

    Ambient temp: 70F.
    Preassure: 30.02 in-Hg
    Humidity: 8%

    Corrected for ambient temp results: 231 HP, 256 lb/ft
    Uncorrected: 240 HP, 265 lb/ft

    MB Dyno.pdf


    MB Dyno.jpg

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    M119 Dyno Results. (1993 400E US)

    With an 18-20% drivetrain loss, that would put your engine at 283-288 HP at the rear wheels, which is quite good.

    Another correction to consider is altitude adjustment. Higher altitudes have less oxygen in the air than when you are closer to sea level. Not a huge factor, but if you are more than 1,500-2,000 feet above sea level then it is another factor to account for.

    Thank you for posting — always great to see 4,2 and 5,0 liter dyno figures. We don’t do enough of that !!

    Cheers,
    Gerry

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    Re: M119 Dyno Results. (1993 400E US)

    Quote Originally Posted by kiev View Post
    Thought it may be interesting to some here. 110k on the odometer. Car has engine computer from a 1992 model (adds power, supposedly). Did the dyno test to see how the engine is doing. It's silly, but hearing that engine sound like a perfectly-working (to my ears) airplane's turbofan was somewhat emotional. What do you guys think?
    Your peak numbers look good for a 93-up 4.2L engine with 92 LH, but the shape of the curve looks funny. There should not be a dip in the power curve just before the peak. Your graph didn't show RPM or MPH so I can't reference the exact range.

    See attached from my 1995 E420, two pulls with stock LH, then two pulls with 1992 LH installed. Note that (1) there is no dip in the power curve as it climbs near redline, and (2) it also does not drop off much at all as it reaches the 6350rpm redline. Yours dropped off up top more than normal. Your curves are also more 'jagged', but that might be due to no smoothing factor applied in the DynoJet software, or something else I'm not aware of.

    Oh, and there are no major differences between your 1993 and my 1995... they should show similar power numbers, and have similar shape of the curve.

    BTW - what gear was the transmission in for your dyno runs? And do you have stock 2.24 differential gears?

    Attached Images Attached Images
    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
    Click here for my YouTube channel

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    Re: M119 Dyno Results. (1993 400E US)

    Is it safe to assume that an unmodified, properly functioning 500E would be ~260 - 265 RWHP?

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    Re: M119 Dyno Results. (1993 400E US)

    Quote Originally Posted by msq View Post
    Is it safe to assume that an unmodified, properly functioning 500E would be ~260 - 265 RWHP?
    Yes. My 1992 was exactly in the 260-265 range on multiple pulls.

    1993 500E dyno graphs are here, showing with stock LH compared with 1992 LH on the same engine/car:
    https://www.500eboard.com/forums/showthread.php?t=545

    I hope to have similar comparison graphs for a 6L engine soon, showing with / without WOT enrichment on the same motor. The 6L modules I sell have WOT enrichment, and can have the top speed limiter optionally removed too.


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    Re: M119 Dyno Results. (1993 400E US)

    Hi GSXR. Happy New Year!

    Attached is graph with RPM line at the bottom. Also, my intake hose was disconnected from the last part that has air meter plugged into it.... I did not realize to check it before dyno. Any thoughts on what RPM graph + intake hose disconnect changes?


    Thank You!


    400e dyno.jpg

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    Re: M119 Dyno Results. (1993 400E US)

    You have an abnormal dip in the power curve between roughly 4800-5600rpm. I don't know what would cause that. Also, the dyno graph is abnormally "choppy", despite having the smoothing set to 5 (see top right of page). This may be something from the dyno itself, not necessarily your car, but I'm not sure. See my graph above for comparison. Your peak HP reading is taking the peak of the choppy curve, which is probably not the most accurate.

    The sensor behind the driver headlight is for intake air temp, it would not have any significant effect on the results.

    What gear was it in? 2nd, 3rd, or 4th?

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
    Click here for my YouTube channel

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    Re: M119 Dyno Results. (1993 400E US)

    Sorry, forgot to mention. He told me he set transmission into 3rd gear for all 3 runs. He's opinion, whatever it's worth, was that the choppiness was due to 3rd gear being so long... The shop specializes in "Subarus and Lancers", they've never dealt with a W124 before. Would be proper to say that based on the dyno that:

    1. there's very low likelihood of compression issues in one (or more) cylinders?
    2. awhile ago I bothered you with head-gasket issue https://www.500eboard.com/forums/arch...p/t-10968.html Does the dyno result in any way play into that?
    3. if you would have to take wild guess, where would you look first into determining the cause for the choppiness and power deep?


    Thanks!

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    Re: M119 Dyno Results. (1993 400E US)

    Heh-heh. Nearly a decade ago, I did back to back pulls on my 95 E420, in both 2nd and 3rd gear, to see how much difference there was in the numbers. There was a noticeable bump in torque (3-4%) until about 5k, above that the curves were nearly identical. And, no choppiness. See attached graph. Now, if your engine is doing something weird, it's possible the 3rd-gear pull (to >130mph on the drum!) was slow enough to allow the dyno to pick up power oscillations which show as a wavy / choppy curve on your car, even with max smoothing applied.

    Low compression doesn't seem likely, but it wouldn't hurt to check. Ditto for a head gasket issue.

    I'm really not sure what to wild guess without more information. Are there ANY codes on any models?

    Attached Images Attached Images

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    Re: M119 Dyno Results. (1993 400E US)

    Where’s that How-To thread on setting up a W124.036/034 for the Dino?
    Greg
    '94 E500
    '03 E320 4Matic Wagon (W210)
    '08 G55

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    Re: M119 Dyno Results. (1993 400E US)

    Quote Originally Posted by 8899 View Post
    Where’s that How-To thread on setting up a W124.036/034 for the Dino?
    Oh yeah! That would be here:

    https://www.500eboard.com/forums/showthread.php?t=2452

    I'm still at a loss to explain the weird drop in power curve. That is probably NOT due to anything in the dyno setup or test procedure. They did good pulls from 2600rpm to the rev limiter, with RPM signal, which is great. Would have been nice to get AFR as well but some shops either can't do this, or charge extra for it.


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    Re: M119 Dyno Results. (1993 400E US)

    4th gear is 1:1 on the 500E, I would assume that's the optimal gear for dyno testing.

    As previously mentioned it appears you're loosing 10whp per 100revs above 6k. Thinking aloud, and taking into consideration gsxr's thoughts about installing a WOT~LH Module eliminating/flattening the 6000-6300rpm.

    The trough/dip at 5250rpm, could it be fuel delivery? Maybe just some "stuffy" injectors? I know factory injectors are not generously oversized. The graph looks like it wants to go on up around 4750rpm but yields, pulls timing maybe because it's not getting enough fuel.

    I'd check the injector spray pattern and the FPR. Other than that looks good!



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    Re: M119 Dyno Results. (1993 400E US)

    As explained in post 9 above, there's not much to be gained by using 4th gear on the 500E... and with a stock chip, it wouldn't pull to redline, you'd hit the 155mph speed limiter first. And, running the dyno drum to 165mph could stress the tires (search YouTube for videos of dynos blowing up tires). So, as explained in the link in post 11, using 3rd gear is preferred on the 500E... and using 2nd is ok on the 400E/E420. (Note that USA-spec 94-95 E420 have a 130mph limiter, and with the 2.24 gears it will not pull to redline in 3rd gear either!)

    I still have no ideas as to why the power curve dips for ~800rpm.


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    Re: M119 Dyno Results. (1993 400E US)

    Quote Originally Posted by gsxr View Post
    As explained in post 9 above, there's not much to be gained by using 4th gear on the 500E... and with a stock chip, it wouldn't pull to redline, you'd hit the 155mph speed limiter first. And, running the dyno drum to 165mph could stress the tires (search YouTube for videos of dynos blowing up tires). So, as explained in the link in post 11, using 3rd gear is preferred on the 500E... and using 2nd is ok on the 400E/E420. (Note that USA-spec 94-95 E420 have a 130mph limiter, and with the 2.24 gears it will not pull to redline in 3rd gear either!)

    I still have no ideas as to why the power curve dips for ~800rpm.

    Thanks gsxr. Yeah I didn't think about the fourth gear at 7k rpm, and I wasn't even aware the diff on the E400Es were so low @ 2.24 Diff/Ratio. That's spinning way up there, it's one thing on paper, but now that I'm visualizing the situation, even without consideratiin to the electronics, it just makes me want to get behind a reinforced wall just in case.




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    Last edited by BigWillieStyle; 1 Week Ago at 06:27 PM.

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